(MODULES-6020) Add spec test for iis_application applicationpool
(MODULES-6020) Add spec test for iis_application applicationpool

This commit adds a spec acceptance test for iis_application
applicationpool parameter

puppetlabs/puppetlabs-iis,jpogran/puppetlabs-iis,jpogran/puppetlabs-iis,puppetlabs/puppetlabs-iis